offset bore it, deck the block change to a better head and shave it, get a cam for it, do a good valve job on it, if rules allow it take the #26 carb and swap it for a #28 and put a steel flywheel on it, You could port the intake slightly but unless your going to crank the rpms that won't do much

His website is Kirk engines . com. He is a great guy to deal with. He has a nice tutorial on building up a k241 and also a k301. Nice pics to view. It pretty much walks you through the whole build process.I just got done building up a k301 from his directions. Cant wait to get it in a tractor and see how it performs. P.S. get your check book out.